Initially, Keyaru aspired to utilize his newfound ability to swiftly heal any wound to advance as a Hero and improve his living standards. However, he was subjected to years of harsh and inhumane treatment instead. Despite this suffering, his power enabled him to clandestinely gain knowledge and expertise from his patients, thereby bolstering his strength. Regrettably, by the time he reached his full potential, all his treasured possessions had slipped through his fingers. Determined to rectify the past, Keyaru cast a spell that would transport him back in time to the commencement of his agony. Bereaved and smoldering with anger, he embarks on a mission to avenge those who had wronged him and rekindle his life.